在下列财产中，（）不能作为抵押物。
A．国有土地使用权
B．国有交通运输工具
C．债券
D．房屋
参考答案：C
Mr. Brown arranged for the taxi to come at six _____ she would not have to wait long at the station. [ ]
A. so that
B. even if
C. before
D. because
Expectations预期
